using Emacs on Macosx myself, I can tell you that emacs 21.2.1 comes
with macosx. If you want a more recent version, you can just checkout
the CVS-Emacs and cd mac; ./make-package —self-contained to get an
installable macosx-app that plays nice with planner.

btw.: a .dmg file is mounted by double-clicking it ;-)

Ooooh, nifty. I wonder if it comes with pretty widgets. I want my mom
to have a menubar right away. <grin>